<template>
  <div>
    <!--面包屑导航区域-->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>权限管理</el-breadcrumb-item>
      <el-breadcrumb-item>角色列表</el-breadcrumb-item>
    </el-breadcrumb>

    <!--卡片视图区域-->
    <el-card class="box-card">
      <el-button type="primary" @click="addDialogVisible=true">添加角色</el-button>
      <!--权限列表区域-->
      <el-table :data="rolesList" border stripe>
        <el-table-column type="expand">
          <template slot-scope="scope">
            <el-row :class="['b_bottom',i1 ===0?'b_top':'','v_center']" v-for="(item1,i1) in scope.row.children"
                    :key="item1.id">
              <!--渲染一级权限-->
              <el-col :span="5">
                <el-tag closable @close="removeRightById(scope.row,item1.id)">{{ item1.authName }}</el-tag>
                <i class="el-icon-caret-right"></i>
              </el-col>
              <!--渲染二级和三级权限-->
              <el-col :span="19">
                <!--  通过for循环嵌套渲染二级权限-->
                <el-row :class="[i2===0?'':'b_top','v_center']" v-for="(item2,i2) in item1.children" :key="item2.id">
                  <el-col :span="6">
                    <el-tag closable @close="removeRightById(scope.row,item2.id)" type="success">{{
                        item2.authName
                      }}
                    </el-tag>
                    <i class="el-icon-caret-right"></i>
                  </el-col>
                  <el-col :span="18">
                    <el-tag closable @close="removeRightById(scope.row,item3.id)" type="warning"
                            v-for="(item3,i3) in item2.children"
                            :key="i3.id">
                      {{ item3.authName }}
                    </el-tag>
                  </el-col>
                </el-row>
              </el-col>
            </el-row>
          </template>
        </el-table-column>
        <el-table-column type="index" label="#"></el-table-column>
        <el-table-column prop="roleName" label="角色名称"></el-table-column>
        <el-table-column prop="roleDesc" label="角色描述"></el-table-column>
        <el-table-column label="操作">
          <template slot-scope="scope">
            <!--修改按钮-->
            <el-button type="primary" icon="el-icon-edit" size="mini" @click="showEditDialog(scope.row.id)">编辑
            </el-button>
            <!--删除按钮-->
            <el-button type="danger" icon="el-icon-delete" size="mini" @click="removeRoleById(scope.row.id)">删除
            </el-button>
            <!--分配角色按钮-->
            <el-button type="warning" icon="el-icon-setting" size="mini" @click="showSetRightDialog(scope.row)">分配权限
            </el-button>
          </template>
        </el-table-column>
      </el-table>
    </el-card>

    <!--添加角色的对话框-->
    <el-dialog
      title="添加角色" :visible.sync="addDialogVisible"
      width="50%" @close="dialogClosed('addFormRef')">
      <!--内容主体区域-->
      <el-form :model="addForm" :rules="formRules" ref="addFormRef"
               label-width="80px">
        <el-form-item label="角色名称" prop="roleName">
          <el-input v-model="addForm.roleName" autocomplete="off"></el-input>
        </el-form-item>
        <el-form-item label="角色描述" prop="roleDesc">
          <el-input v-model="addForm.roleDesc" autocomplete="off"></el-input>
        </el-form-item>
      </el-form>
      <!--底部区域-->
      <span slot="footer" class="dialog-footer">
    <el-button @click="addDialogVisible = false">取 消</el-button>
    <el-button type="primary" @click="AddRole">确 定</el-button>
  </span>
    </el-dialog>

    <!--修改角色的对话框-->
    <el-dialog
      title="修改角色" :visible.sync="editDialogVisible"
      width="50%" @close="dialogClosed('editFormRef')">
      <!--内容主体区域-->
      <el-form :model="editForm" :rules="formRules" ref="editFormRef"
               label-width="80px">
        <el-form-item label="角色名称" prop="roleName">
          <el-input v-model="editForm.roleName" autocomplete="off"></el-input>
        </el-form-item>
        <el-form-item label="角色描述" prop="roleDesc">
          <el-input v-model="editForm.roleDesc" autocomplete="off"></el-input>
        </el-form-item>
      </el-form>
      <!--底部区域-->
      <span slot="footer" class="dialog-footer">
    <el-button @click="editDialogVisible = false">取 消</el-button>
    <el-button type="primary" @click="editRole">确 定</el-button>
  </span>
    </el-dialog>

    <!-- 分配权限 -->
    <el-dialog
      title="分配权限"
      :visible.sync="setRightDialogVisible"
      width="50%"
      @close="setRightDialogClosed"
    >
      <!--树形结构-->
      <el-tree
        :data="rightsList"
        :props="treeProps"
        ref="treeRef"
        show-checkbox
        node-key="id"
        default-expand-all
        :default-checked-keys="defKeys"
      ></el-tree>
      <span slot="footer" class="dialog-footer">
        <el-button @click="setRightDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="allotRights">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>

<script>
export default {
  name: 'Roles',
  data () {
    return {
      // 所有角色列表
      rolesList: [],
      // 添加角色表单
      addForm: {
        roleName: '',
        roleDesc: ''
      },
      // 编辑角色表单
      editForm: {
        roleId: '',
        roleName: '',
        roleDesc: ''
      },
      // 角色表单验证规则
      formRules: {
        roleName: [
          {
            required: true,
            message: '请输入角色名称',
            trigger: 'blur'
          }
        ],
        roleDesc: [
          {
            required: true,
            message: '请输入角色名称',
            trigger: 'blur'
          }
        ]
      },
      // 控制添加角色对话框的显示与隐藏
      addDialogVisible: false,
      // 控制修改角色对话框的显示与隐藏
      editDialogVisible: false,
      // 控制分配权限对话框的显示与隐藏
      setRightDialogVisible: false,
      //   当前即将分配权限的Id
      roleId: 0,
      //   默认选中节点ID值
      defKeys: [],
      // 权限列表
      rightsList: [],
      //  树形控件的属性绑定对象
      treeProps: {
        label: 'authName',
        children: 'children'
      }
    }
  },
  created () {
    this.getRolesList()
  },
  methods: {
    async getRolesList () {
      const { data: res } = await this.$http.get('roles')
      if (res.meta.status !== 200) {
        return this.$message.error('获取角色数据失败')
      } else {
        this.rolesList = res.data
      }
    },
    //  监听添加用户对话框关闭事件
    dialogClosed (formRefName) {
      this.$refs[formRefName].resetFields()
    },
    // 添加角色
    AddRole () {
      this.$refs.addFormRef.validate(async valid => {
        if (!valid) return
        // 发起添加角色的网络请求
        const { data: res } = await this.$http.post('roles', this.addForm)
        if (res.meta.status !== 201) {
          this.$message.error('添加角色失败')
        } else {
          this.$message.success('添加角色成功')
          this.addDialogVisible = false
          this.getRolesList()
        }
      })
    },
    // 显示修改对话框
    async showEditDialog (id) {
      // 根据id获取角色信息
      const { data: res } = await this.$http.get(`roles/${id}`)
      if (res.meta.status !== 200) {
        return this.$message.error('查询角色失败!')
      }
      this.editForm = res.data
      this.editDialogVisible = true
    },
    // 修改角色
    editRole () {
      this.$refs.editFormRef.validate(async valid => {
        if (!valid) return
        const { data: res } = await this.$http.put(`roles/${this.editForm.roleId}`,
          {
            roleName: this.editForm.roleName,
            roleDesc: this.editForm.roleDesc
          })
        if (res.meta.status !== 200) {
          return this.$message.error('修改角色信息失败')
        }
        this.editDialogVisible = false
        await this.getRolesList()
        this.$message.success('修改角色信息成功')
      })
    },
    // 删除角色
    async removeRoleById (id) {
      const confirmResult = await this.$confirm('此操作将永久删除该角色, 是否继续?', '提示', {
        confirmButtonText: '确定',
        cancelButtonText: '取消',
        type: 'warning'
      }).catch(err => err)
      // 如果用户确认删除，则返回值为字符串 confirm
      // 如果用户取消了删除，则返回值为字符串 cancel
      if (confirmResult === 'cancel') {
        return this.$message.info('已消取删除')
      }
      //  发起删除请求
      const { data: res } = await this.$http.delete(`roles/${id}`)
      if (res.meta.status !== 200) {
        return this.$message.error('删除角色失败')
      } else {
        this.$message.success('删除角色成功')
        await this.getRolesList()
      }
    },
    //  根据ID删除对应的权限
    async removeRightById (role, rightId) {
      // 弹框提示 删除
      const confirmResult = await this.$confirm(
        '此操作将永久删除该权限, 是否继续?',
        '提示',
        {
          confirmButtonText: '确定',
          cancelButtonText: '取消',
          type: 'warning'
        }
      ).catch(err => err)
      // 点击确定 返回值为：confirm
      // 点击取消 返回值为： cancel
      if (confirmResult !== 'confirm') {
        return this.$message.info('已取消权限删除')
      }

      const { data: res } = await this.$http.delete(
        `roles/${role.id}/rights/${rightId}`
      )
      if (res.meta.status !== 200) {
        return this.$message.error('删除权限失败！')
      }
      role.children = res.data
      //   不建议使用
      // this.getRolesList()
    },
    // 展示分配权限的对话框
    async showSetRightDialog (role) {
      this.roleId = role.id
      // 获取角色的所有权限
      const { data: res } = await this.$http.get('rights/tree')
      if (res.meta.status !== 200) {
        return this.$message.error('获取权限数据失败！')
      }
      //   把获取到的权限数据放到data中
      this.rightsList = res.data
      // 递归获取三级节点的id
      this.getLeafkeys(role, this.defKeys)
      this.setRightDialogVisible = true
    },
    // 通过递归 获取角色下三级权限的 id, 并保存到defKeys数组
    getLeafkeys (node, arr) {
      // 如果node节点没有children属性，则是三级节点
      if (!node.children) {
        return arr.push(node.id)
      }
      node.children.forEach(item => this.getLeafkeys(item, arr))
    },
    // 权限对话框关闭事件
    setRightDialogClosed () {
      // 清除多次点开角色所拥有的权限，不然会累计在数组中
      this.defKeys = []
    },
    //  点击确定为角色授权权限
    async allotRights (roleId) {
      // 获得当前选中和半选中的Id
      const keys = [
        ...this.$refs.treeRef.getCheckedKeys(),
        ...this.$refs.treeRef.getHalfCheckedKeys()
      ]
      // join() 方法用于把数组中的所有元素放入一个字符串
      const idStr = keys.join(',')
      const { data: res } = await this.$http.post(`roles/${this.roleId}/rights`, { rids: idStr })
      if (res.meta.status !== 200) {
        return this.$message.error('分配权限失败！')
      }
      this.$message.success('分配权限成功!')
      await this.getRolesList()
      this.setRightDialogVisible = false
    }
  }
}
</script>

<style lang="less" scoped>
.el-tag {
  margin: 7px;
}

.b_top {
  border-top: 1px solid #eee;
}

.b_bottom {
  border-bottom: 1px solid #eee;
}

.v_center {
  display: flex;
  align-items: center;
}
</style>
